assets(brand): add @sovren_software X profile banner

1500x500px banner created for @sovren_software X account during the
@mrhaven_io → @sovren_software consolidation (2026-03-13).

Both PNG (uploaded to X) and SVG (source) formats included.
Banner surfaces the three-product stack: Esver OS, Visage, Mr Haven.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ccross2